#include <REGX52.H>
#include <INTRINS.h>
void Delay(unsigned int xms)	 //@12.000MHz 
{
	unsigned char i, j;
	while(xms--){
		i = 2;
	  j = 239;
	do
	{
		while (--j);
	} while (--i);
	}
}
void main()
{
		unsigned char LEDNum = 0;
		P2 = ~0x01;//初始化第一个灯亮
		while(1)
		{
			if(P3_1 == 0)
			{
				Delay(20);
				while(P3_1 == 0);
				Delay(20);
				
				LEDNum++;
				if(LEDNum>=8)
						LEDNum=0;
				P2=~(0x01<<LEDNum);
			}
			if(P3_0 == 0)
			{
				Delay(20);
				while(P3_0 == 0);
				Delay(20);

				if(LEDNum==0)
						LEDNum=7;
			  else
						LEDNum--;
				P2=~(0x01<<LEDNum);
			}
		}
}